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Pal's winning move in game (4)

Ross

I believe the answer is:

mate

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'pal's' is the definition.
(both can mean a friend)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for mate that I've seen before include "Marry - friend" , "China" , "Companion, wife" , "Pal, chum" , "Chess ending; pal" .)

I've seen this clue in The Telegraph.
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